V-opening screen



June 15, 1948. i BANNlNG 2,443,176

v orsume scnmm Filed Feb. 21, 1945 nv VE/Y roe LLOYD HAROL BANANA/G ATTOENE Y Patented June 15, 1948 UNITED STATES PATENT OFFICE V-OPENING SCREEN Lloyd H. Banning, Trojan, S. Dak., assignor to the United States of America as represented by the Secretary of Interior amended April 30, 1928; 370 0. G. 757) 1 The invention described herein may be manufactured and used by or for the Government of the United States for governmental purposes without the payment to me of any royalty there- 2 bers parallel to the bars, and may also be applied to the cylindrical type by substituting for the supporting member 26 a circular member and for the member 21 a circular member larger than on in accordance with the provisions of the act 5 the first, of April 30, 1928 (Ch. 460, 45 Stat. L. 467). While I have shown and described certain em- My invention relates to screen surfaces for the bodiments of my invention, it is t be underelimination of flat and elongated pieces from a stood that it is capable of many modifications mass of crushed rock. It is particularly adapted and changes in the construction and arrangeto provide a novel screen which is non-clogging l0 ment without departing from the spirit and scope and which may be substituted for a common form of the invention, as disclosed in the appended of screen, in a standard low head vibrating claim, in which it is my intention to claim all screen mechanism novelty inherent in my invention as broadly as A preferred form of my invention is illustrated possible in viewof the prior art. in the accompanying drawings in which: What I claim is:

Figure 1 is a plan view of my screen. A screen of the class described comprisin two Figure 2 is a side elevation. spaced supports, a plurality of parallel bars each Figure3 is an end elevation. having one down-turned end terminally secured In these drawings: to said supports, a second plurality of parallel A screen 2| includes a plurality of parallel bars alternating with said first bars each bar screening bars 22, each having a downwardly being longer than said first set and having one and reversely-bent terminal portion 23. Alterdown-turned end longer than those of said first nating between but inclined to the bars 22 are a set and being reversely bent and secured to said plurality of shorter bars 24 each having a downsupports, whereby said second bars provide asupt d portion 25 25 porting surface upwardly inclined with respect One end of each bar. 22 and 24 is rigidly seto said first set and form with said first set a cured in a transverse supporting member 26. plurality of V-shaped openings inclined to the The down-turned portions 23 and 25 are rigidly general contour of the screen and both sets of secured to a transverse support 21. The center bars are higher than the support: at the discharge lines of the bars 22 and 24 are in planes which end of the screen. intersect in the support 26 and diverge in the LLOYD H. BANNING. direction of the support 21. The bars 22 are also longer than the intermediate bars 24 for the pur- REFERENCES CITED D o eliminating a Poss il ty of 38 9 l The following references are'of record in the screen at the ililischarge side. ml b i fil of this patent:

As the crus ed rock is moved w e eing v brated, by means not shown, from the left to the UNITED STATES PATENTS right of my screen, Figure 1, the fiat and elon- Numb r Na t gated pieces are progressively turned edg w 15,785 Smith Sept. 23, 1856 with their longest axis substantially parallel w 40 292,560 Jones Jan, 29, 1884 my bars. These flat pieces fall through the V- 454,393 Bartl et a1. June 16, 1891 shaped openings at points where a flat piece ma 798,382 Allard Aug. 29, 1905 pass edgewise through an opening. Obvious y. 1,716,486 Davis .2 June 11, 1929 my invention is also adapted for eliminating rela- 46 2,321,166 Symons June 194 zlg'aelly flat pieces of slate from crushed anthracite FOREIGN PATENTS The bars of my screen may be formed of tubing Number Country Date into which the end of a solid bar may be inserted, 4,866 Great Britain Apr. 20, 1885 the two being rigidly connected either detach- 338,608 Great Britain Nov, 27, 1930 ably to provide for renewing worn-out tubes, or 50 OTHER REFERENCES permanently as by spot welding for simplicity and reduction of the first cost.

My invention may be applied to an inclined stationary screen by the addition of side mem- Publication: Bureau of Mines Report of Investigations 3781, Sept. 1944, Figs. 2 and 3 relied on, by Lloyd H. Banning and F. D. Lamb. 

